355 lines
8.4 KiB
C
355 lines
8.4 KiB
C
/*
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* misc.c
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*
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* This is a collection of several routines from gzip-1.0.3
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* adapted for Linux.
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*
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* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
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* puts by Nick Holloway 1993, better puts by Martin Mares 1995
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* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
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*/
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#include "miscsetup.h"
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#include <asm/io.h>
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/*
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* gzip declarations
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*/
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#define OF(args) args
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#define STATIC static
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#undef memset
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#undef memcpy
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#define memzero(s, n) memset ((s), 0, (n))
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typedef unsigned char uch;
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typedef unsigned short ush;
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typedef unsigned long ulg;
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#define WSIZE 0x8000 /* Window size must be at least 32k, */
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/* and a power of two */
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static uch *inbuf; /* input buffer */
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static uch window[WSIZE]; /* Sliding window buffer */
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static unsigned insize = 0; /* valid bytes in inbuf */
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static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
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static unsigned outcnt = 0; /* bytes in output buffer */
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/* gzip flag byte */
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
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#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
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#define RESERVED 0xC0 /* bit 6,7: reserved */
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#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
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/* Diagnostic functions */
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#ifdef DEBUG
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# define Assert(cond,msg) {if(!(cond)) error(msg);}
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# define Trace(x) fprintf x
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# define Tracev(x) {if (verbose) fprintf x ;}
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# define Tracevv(x) {if (verbose>1) fprintf x ;}
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# define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
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# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
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#else
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# define Assert(cond,msg)
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# define Trace(x)
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# define Tracev(x)
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# define Tracevv(x)
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# define Tracec(c,x)
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# define Tracecv(c,x)
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#endif
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static int fill_inbuf(void);
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static void flush_window(void);
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static void error(char *m);
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static void gzip_mark(void **);
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static void gzip_release(void **);
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/*
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* This is set up by the setup-routine at boot-time
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*/
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static unsigned char *real_mode; /* Pointer to real-mode data */
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#define EXT_MEM_K (*(unsigned short *)(real_mode + 0x2))
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#ifndef STANDARD_MEMORY_BIOS_CALL
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#define ALT_MEM_K (*(unsigned long *)(real_mode + 0x1e0))
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#endif
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#define SCREEN_INFO (*(struct screen_info *)(real_mode+0))
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extern char input_data[];
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extern int input_len;
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static long bytes_out = 0;
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static uch *output_data;
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static unsigned long output_ptr = 0;
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static void *malloc(int size);
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static void free(void *where);
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static void putstr(const char *);
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extern int end;
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static long free_mem_ptr = (long)&end;
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static long free_mem_end_ptr;
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#define INPLACE_MOVE_ROUTINE 0x1000
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#define LOW_BUFFER_START 0x2000
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#define LOW_BUFFER_MAX 0x90000
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#define HEAP_SIZE 0x3000
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static unsigned int low_buffer_end, low_buffer_size;
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static int high_loaded =0;
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static uch *high_buffer_start /* = (uch *)(((ulg)&end) + HEAP_SIZE)*/;
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static char *vidmem = (char *)0xb8000;
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static int vidport;
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static int lines, cols;
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#include "../../../../lib/inflate.c"
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static void *malloc(int size)
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{
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void *p;
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if (size <0) error("Malloc error");
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if (free_mem_ptr <= 0) error("Memory error");
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free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
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p = (void *)free_mem_ptr;
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free_mem_ptr += size;
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if (free_mem_ptr >= free_mem_end_ptr)
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error("Out of memory");
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return p;
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}
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static void free(void *where)
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{ /* Don't care */
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}
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static void gzip_mark(void **ptr)
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{
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*ptr = (void *) free_mem_ptr;
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}
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static void gzip_release(void **ptr)
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{
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free_mem_ptr = (long) *ptr;
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}
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static void scroll(void)
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{
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int i;
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memcpy ( vidmem, vidmem + cols * 2, ( lines - 1 ) * cols * 2 );
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for ( i = ( lines - 1 ) * cols * 2; i < lines * cols * 2; i += 2 )
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vidmem[i] = ' ';
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}
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static void putstr(const char *s)
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{
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int x,y,pos;
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char c;
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x = SCREEN_INFO.orig_x;
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y = SCREEN_INFO.orig_y;
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while ( ( c = *s++ ) != '\0' ) {
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if ( c == '\n' ) {
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x = 0;
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if ( ++y >= lines ) {
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scroll();
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y--;
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}
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} else {
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vidmem [ ( x + cols * y ) * 2 ] = c;
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if ( ++x >= cols ) {
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x = 0;
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if ( ++y >= lines ) {
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scroll();
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y--;
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}
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}
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}
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}
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SCREEN_INFO.orig_x = x;
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SCREEN_INFO.orig_y = y;
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pos = (x + cols * y) * 2; /* Update cursor position */
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outb_p(14, vidport);
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outb_p(0xff & (pos >> 9), vidport+1);
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outb_p(15, vidport);
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outb_p(0xff & (pos >> 1), vidport+1);
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}
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void* memset(void* s, int c, unsigned n)
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{
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int i;
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char *ss = (char*)s;
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for (i=0;i<n;i++) ss[i] = c;
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return s;
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}
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void* memcpy(void* dest, const void* src, unsigned n)
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{
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int i;
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char *d = (char *)dest, *s = (char *)src;
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for (i=0;i<n;i++) d[i] = s[i];
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return dest;
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}
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/* ===========================================================================
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* Fill the input buffer. This is called only when the buffer is empty
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* and at least one byte is really needed.
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*/
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static int fill_inbuf(void)
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{
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if (insize != 0) {
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error("ran out of input data");
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}
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inbuf = input_data;
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insize = input_len;
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inptr = 1;
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return inbuf[0];
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}
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/* ===========================================================================
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* Write the output window window[0..outcnt-1] and update crc and bytes_out.
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* (Used for the decompressed data only.)
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*/
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static void flush_window_low(void)
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{
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ulg c = crc; /* temporary variable */
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unsigned n;
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uch *in, *out, ch;
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in = window;
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out = &output_data[output_ptr];
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for (n = 0; n < outcnt; n++) {
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ch = *out++ = *in++;
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c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
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}
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crc = c;
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bytes_out += (ulg)outcnt;
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output_ptr += (ulg)outcnt;
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outcnt = 0;
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}
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static void flush_window_high(void)
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{
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ulg c = crc; /* temporary variable */
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unsigned n;
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uch *in, ch;
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in = window;
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for (n = 0; n < outcnt; n++) {
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ch = *output_data++ = *in++;
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if ((ulg)output_data == low_buffer_end) output_data=high_buffer_start;
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c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
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}
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crc = c;
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bytes_out += (ulg)outcnt;
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outcnt = 0;
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}
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static void flush_window(void)
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{
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if (high_loaded) flush_window_high();
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else flush_window_low();
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}
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static void error(char *x)
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{
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putstr("\n\n");
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putstr(x);
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putstr("\n\n -- System halted");
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while(1);
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}
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void setup_normal_output_buffer(void)
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{
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#ifdef STANDARD_MEMORY_BIOS_CALL
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if (EXT_MEM_K < 1024) error("Less than 2MB of memory");
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#else
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if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < 1024) error("Less than 2MB of memory");
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#endif
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output_data = (char *)0x100000; /* Points to 1M */
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free_mem_end_ptr = (long)real_mode;
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}
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struct moveparams {
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uch *low_buffer_start; int lcount;
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uch *high_buffer_start; int hcount;
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};
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void setup_output_buffer_if_we_run_high(struct moveparams *mv)
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{
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high_buffer_start = (uch *)(((ulg)&end) + HEAP_SIZE);
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#ifdef STANDARD_MEMORY_BIOS_CALL
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if (EXT_MEM_K < (3*1024)) error("Less than 4MB of memory");
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#else
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if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < (3*1024)) error("Less than 4MB of memory");
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#endif
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mv->low_buffer_start = output_data = (char *)LOW_BUFFER_START;
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low_buffer_end = ((unsigned int)real_mode > LOW_BUFFER_MAX
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? LOW_BUFFER_MAX : (unsigned int)real_mode) & ~0xfff;
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low_buffer_size = low_buffer_end - LOW_BUFFER_START;
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high_loaded = 1;
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free_mem_end_ptr = (long)high_buffer_start;
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if ( (0x100000 + low_buffer_size) > ((ulg)high_buffer_start)) {
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high_buffer_start = (uch *)(0x100000 + low_buffer_size);
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mv->hcount = 0; /* say: we need not to move high_buffer */
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}
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else mv->hcount = -1;
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mv->high_buffer_start = high_buffer_start;
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}
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void close_output_buffer_if_we_run_high(struct moveparams *mv)
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{
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if (bytes_out > low_buffer_size) {
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mv->lcount = low_buffer_size;
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if (mv->hcount)
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mv->hcount = bytes_out - low_buffer_size;
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} else {
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mv->lcount = bytes_out;
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mv->hcount = 0;
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}
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}
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int decompress_kernel(struct moveparams *mv, void *rmode)
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{
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real_mode = rmode;
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if (SCREEN_INFO.orig_video_mode == 7) {
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vidmem = (char *) 0xb0000;
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vidport = 0x3b4;
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} else {
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vidmem = (char *) 0xb8000;
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vidport = 0x3d4;
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}
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lines = SCREEN_INFO.orig_video_lines;
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cols = SCREEN_INFO.orig_video_cols;
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if (free_mem_ptr < 0x100000) setup_normal_output_buffer();
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else setup_output_buffer_if_we_run_high(mv);
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makecrc();
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putstr(".\nDecompressing Linux...");
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gunzip();
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putstr("done.\nBooting the kernel.\n");
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if (high_loaded) close_output_buffer_if_we_run_high(mv);
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return high_loaded;
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}
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